@article{CMH_1994__69_4_140326,
     author = {B.H. Bowditch},
     title = {Some results on the geometry of convex hulls in manifolds of pinched negative curvature.},
     journal = {Commentarii mathematici Helvetici},
     pages = {49--81},
     publisher = {mathdoc},
     volume = {69},
     number = {4},
     year = {1994},
     zbl = {0967.53022},
     url = {http://geodesic.mathdoc.fr/item/CMH_1994__69_4_140326/}
}